The National Survey File provides township/range and section polygons for 32 states as surveyed from 1797 to the present, with districts/boroughs for 10 East Coast states and block/section/abstract polygons for Texas. Based on the U.S.G.S. 7.5-minute topographic quadrangles (15 minute where 7.5 minute is not available), the file is derived from a latitude/longitude-based system of known geodetic accuracy.

The use of recently compiled orthophotography in Texas and South Louisiana provide an even higher level of accuracy where the survey is more complex, and where oil and gas drilling activity is high. The geodetically-precise orthophotos were created by using the horizontal and vertical control from the U.S.G.S. 7.5-minute topographic quadrangles. The mapping in these areas incorporates the most current data available from public and selected private sources. Where the most accurate and up-to-date information is needed, the orthophoto-based data is essential.

Tobin SuperBase Land Survey product:

Jeffersonian and Carter
Section, Township and Range polygons with attributes describing the Meridian, Township, Range, Section, County, and State identifiers.

Texas
Survey, Block, Section, and Abstract polygons with attributes describing the Survey Name, Block designation(s), Section and Abstract numbers, County and State identifiers.

Offshore
Polygons describing the Areas and Blocks in the Federal Waters of the Gulf of Mexico. Attributes include the Area name, Block number, Federal; County and State identifiers.*

Eastern States
Civil Township, District or Burrough polygons with the attributes describing the Township name, County, and State identifiers.

Alaska
Districts – Alaska does not have counties.

Uses:
1. Land title management
2. Used in legal descriptions (leases, wells, property)
3. Facilities management
4. Helps track pipeline routes